williams



S. B. WILLIAMS, la.

TELEPHONE SYSTEM.

APPLICATION mu) JAN. :5. :920.

1,438,736. Patented 12%. 12,1922.

fly. 2 $HEETS-SHEH 1.

//7 1 enfor: Samue/B. wfl/famj. J7.

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Patented Dec. 12, 1922.

.4 UNITED STATES RAT EN'T OFFICE "SAMUEL D. WILLIAMS, JR., 0]? BROOKLYN,NEW YOIFK. ASSIGNOR TO WESTERN ELECTRIC COMPANY, DICOBPORATED, OF-NEW-YORK, N. Y-, A CORPORATION OF NEW' YORK.

, Tmrnoms sY ST'EIL:

Application filer! January 19.1 5205 Serial 11013 13 5; j

To all-w homitm dy concern:

,b'eit lmown'thatjl, S: tori. B. WnLLuMB, J r n citizeirrofiithev UnitedStates, residing at Brooklyn county of Kings, State jof blew prk, .l |e.,v e, invented certain new and usefuliimprovements. in TelephoneSystems, of ,whichgthe-follo wing is a full, clear, coa rise. and exactdescription. f

This invention relates to telephone systerns and more-particularly toautomatic switches .forinterconnecting lines in such systems.

It is the object oi'this invention to pro- -."ide-n switch of simplestructure nnd posi- Live opnration which may be moved in a single 4direction i to connect; one -teieph'one line with either-oyeiticulaniine or with an idle one of a group of lines. o

Referri'ng-tp-.the drawings,'. Figs; 1, 2 and iftiivith 'Fig. 1 tothe-ri ht of Figs. .2 and 3 show; p,;"telephqne;, svs m embodying thepresentiinvention. ig. llshorgcs olperspectivendewofga switch embodyinthisinventicn together \vithi-e diagram o eircuits for the. switch, anda. snbscribers sulstction; '-ig.-2,shows an incomin trunk line. with oneend oiu. cord circuit or connection therewith; ,end Fig. 3 shows an out-'cin 1't111 nklinewith one end of the cordcircuitforconnectiontherewith. The nipmentshownto the rightmf the dottedines in Figs 2 and dis-preferably located in the some 'oflice as thatshown .in Fig. Ijand that shown-.to-the left of the,dotted lines maylie-locatedat a central office. 'Inthe presentfembodiment of theinvention. a sw tch such as is-disclosed in Fig. 1 provided idividual toeach vsubscribers lineus' well as each incoming-trunk line. The switchcomprises'frameipiecesl .and 2, thejends of which are slotted to receivea blur-3 slidableiherein. A rod 4secured to the frame in any suitablemanner rotatably snpportsa number of contact opera.

', arms 5, which are provided at one end wit ears 6 to receive thcrod 4,and at the other rngl with wins 7. car. "ng rollers 8; Secured to therod dare coi sprinFs 9 which keep the rollers}! in contact wit the uppersurfew of the bar. 3. in am (his provided for-each snbscribe1"s.1ine,andfor'each outgoing line-to which the switch has nccessin .addition towhich there are" proshown at the right of \ided twofarmsfi Fi 1 for u,purpose to be later described.

Secured in any suitable mennertoithe bottom of eech aunt, 'which-fisindividual to an ontgo|ng t1nnl.line;:-i insert: in's'u latmg mater al10 in which lie1d sprin 11, 2; 13 and 14, thejreslr ends p-o fiwhic areadapted 'to be 'used'for solderingfterminals. .The-front endsofthese-sprmg s a re nd usted to-normally restgabove line hers, 15, 16,17, and 18 which are rigidly secured tothe frame and insulated therefromin suitable manner. Similzirljr each arm 5 in d vidual to a line withinthetlomhoflicecarmes springs 12, 13 and 14 'whichcooperate wlt-h bars 1617 and 18 respectively: 1

The bar 3 isprovide'd withHnoteheS-IQ and a cam surface 20 ar spsoed sothat movement ofv the baritbtheri {from normal positionwwill 11 ow 5 11s..,. -;w sue oess vely. ride 7 into th'e'xnotchesi lii';Itherebyhringig springs 11,12,13 endjfifinto engager nent with hars .l5,: 16,.17; nnd 1.8.r e speeuvely. The betwenisuceessive notches 19 isconsequently. made "greeter than the. distance between: successive arms5 by an amount equalfto the length ofone ormore teeth of .the ratchet21. ecnredtp theofm ne member 2 is 28 eannyln' anhrmatnro kvf-Qistbfiehdof which ispivotallymountedfn 'pawl I hc pawl .25iis held in engagementwith is 111120, Afixedto the frame, byln; spring 27 and 1s: arranged sothat whenlhemrmatu're 241s 111 normal osition,.the pawl 25flis clearpfbar- 3; i ,armatureuihi is'Jittmcted, pawl 25 engzgm. one ofi'thete'eth21 whlch are cut on; elowersidelof so 3 and moves the bar 3 totile-right. Secured to fremel by .a screw 28! is aresetting or releasingma net'29, provided with-an annature,-.30.,piv ed to one end. offwhichis a pawl 31, 'Pawl..31 is held in en' gement with a-pin 82, whichis seeuredto t e'frame, bye spring' 33 .so that when arm aturefifi is.retraeted. pawl 31 is clear of. the teethr 2 2 dinner-inte ration the i(ii conductor 66 through the winding of thc'stc ppiuor magnet '22 togrounded battery. Mngnet l3 and relay 65 .im energized in this circuit,magnet, '23 attracting its armature -24, thereby-causing bar 3 to moveone step to the right so tha the roller Set the first line am s inhitsnotch 19. and roller 8 or the off-normal arm Oh' is raised from itsnotch lD'to the upper surface of bar 3, to operate the off-normalsprings to 58 in the manner previously described. Spring 53 in breakingcontact with spring 54 and making contact with spring 52 removes thedialing tone from the calling line and provides substitute circuit forstepping relay 59. Upon the second and succeeding retractions of thenim'nture of relay 59 a circuit is completed from ground, arm nturenn'clback contact of may 59, inner right-hand armature and front Contact ofrelay G3 righthand armature and front contact of relay 65, through thewinding of relay 65, conductor 66, thi"ough the winding of the steppingmagnet 23'to grounded battery, thus main dining relay energized andcausing the magnet 23 to step bar 3 to the right, sucrcss'lrelv droppingeach roller 8 into its netchl!) and returning it to the upper surfaceother 3 until the roller 8 of the desired line which will be assumed tobe the line 5. R, Tfl'drops into its notch 19. Upon the fi'rst'deenergizntion of line relay 59, a circuit wus'also completed in parallel withthat traced irom ground, armature and back contact of relay '59, innerright-hand armature :md front contact of relay 63, right-hand armatureand back contact of relay 65, springs 56 and 55. through the winding ofrelay 6? to'grounclerl battery. Relay 6'! was energized in this circuitand locked up over a circuit extending from battery, through the inding.front contact and armature of relnyfii, the armature and back contact ofrelay 68, and the'front contact and outer right-hand armature or relay63 to round. it the called line is busv, ground put ential' will hefound on its cont uctor S, bein}: supplied thereto through the left-handarmature o-E itsnelav 63 if the line is busy as n calling'lingan in amanner be be described if" the 'line' is busv as a celled line.Thisground will beex-tenderlover spring 12. bar 1 6, conductor 69left-hand armature and sriri'zigTOof relay G5, and through the Windingoftcst relay T1 of the calling line to grounded battery. 'Relny 71 willhe enei L'zed hithis Circuitand upon the de'energiwhen of relaw' 65, dueto the cessation of impulses from thwliuc rcla v,-a locking circuit willhe completetlor relay 71 from battery, through the winding of relay 71,spring and its normal contact. front contact and right hanll' armatureof relay Tl. conductor 72 front contact and outer right-hand armalureolrcluy 63 to ground. A busy tone will thisicircuit is a aui Blc'utting 06the then be transmitted to the calling subscriber from ground, throughthe left-hand winding of the transformer Z, front-contact and innerleft-hand armature of relay 71, back contact and inner armature of relay61, through the apparatus at substation A, outer armature and backcontact of relay 61, winding of relay 59 and impedance coil 62 togrounded battery. The calling subscriber hearing this tone will replacehis'receiver on its hook, thereby interrupting the circuit for linerelay '59. Relay 59, in deener izing, opens the circuit for relay 63which eenergizes to complete a circuit from ground, armature and backcontact of relay 59, inner right-hand armature and back contact of relay63,-springs '57 and 58 closed while the switch is away from normalposition, springs 37- and 35, through the winding of the release-magnet29 to grounded battery. Magnet 29 is energized in this circuit and inattractingits armature 30-forces pawl 31 into engagement with a tooth 22to move the bar 3 to 'the left and opens the contact between springs 35and 37' to interrupt its own circuit, thereby.causing its cleenergization. Upon' each retraction of armature 30, completed by the closure ofsprings -35 and 37 so that magnet 29 continues to move the bar 3-untilit reaches its norinalposition, at which-time roller 8 of the arin ON indropping into it's notch 19 permanently interrupts the release magnetcircuit by opening the contacts between springs 57 and 58. Relay 63, inretracting its outer right-hand-armature, interrupte the lockingcircuitsofrelaysfi? and 71' and the-switch'iscompletel ,restored.

": Ifthecalled'line is ound idle, battery potential' will be presenton.its conductor S, p

being supplied thereto from grounded battery, through the winding ofcutr'ofi relay 61 ofthe called line, back contact and left-hand armatureof relay 63 of the called line to its conductor S, and a circuit will becompleted through conductor S spring 12, bar 16, conductor 69,-left-hancontact of relay'65, through the left-hand winding of relay 73, backcontact and righ hanrl' armature of relay 71,i conductor 72, through thefront contactand outer righthand armature of relay 63 toground. Bela 6of the called line and relay 73 of the cal in line are energize in'thiscircuit, relay line relay of the calle line. Relay 73, in attracting itsinner right immatures, completes a-circuit for ringin the calledsubscribers bell from ground battery, through the secondary windin oftransformer, throu h the winding 0? relay 680i the calling lln8,"f10fltcontact and left-hand armature of relay 67, front contact and middle rilit-hand armatute of relay 73, springs 471m 40, bar 17, spring 13,conduc tor 11 conductor R of the' called line,

armature and back.

through the apparatus at the called substation, conductor '1 of thecalled line, conductor T", spring 14, bar 13, springs 39 and 45.innermost right-hand armature and front contact of relay 73, through theimpedance coil and springs 53 and 52 to ground. A by-path circuit forringing current is also provided through the contacts of the inner rightarmatures of relay 73 and the resist ance 81 to the a paratus of thecalling substation to provi e ringin tone to notify the callingsubscriber that t e called station is being signalled. The resistance 81is of such a value that the ringing current traversing the callingsubscribers circuit is suflicient to be heard, but .not suliicient to beannoying, nor is it sufiicient to cause the energization of relay 68.Resistance 81, being of the noninductive typefas indicated, forms ashunt around relay 59 when the talking circuit is completed-so that thetransmission of talkingcurrent is not affected by the inductive win notrelay 59. The bell at the called station is rung in the circuit abovedescribed but rela 68 is marginal and will not energhize unt the calledsubscriber answers. At is tim relay 68 is energized to interrupt thelocking circuit previously traced for relay 67 and relay 67 inretracting its lefthand armature cuts 05 the ringing current. The callinand called substations are now connectedor conversational purposes overthe circuit shown in 'heavy black conductors in Fig. 1, batte beingsupplied to both calling and calls lines through impedance coils 60 and62, and relay 59 being held energizedover. the loo of the callingsubscribers substation. the-conclusion of the conversation, :when bothsubscribers have relaiced their-receivers on their hooks, the circuitfor relay 59 is interrupted to deenerize this-relay. ,Release of theconnection and restoration of the switch to normal now takes place inexactly the same manner as was described when the calling subscriberabandoned thaconnection upon finding the called line busy. 4

. If the subscriber at station A'desires a central ofiice connection, heoperates his calling device 64 to-sentl a greater number oi impulsesthan 181:8 required to operate his switch to connect him with any'cthersubscribers line in the. branch exchange, thus relays 59,63, 65 and 67are operated in the d same manner as was described for a connec tionwithin the branch exchange, but thrright step ing magnet 28 moves bar 3to the until the arm TK is raised to operate springs- 39 to 49 by theengagement of roller 8 with cum surface 20 of bar 3. Simultaneously,with the operation of these springs. the arm 5. shown at the extremeleft of Fig. 1, drop into its notch 19, thereby completing cm:- tnctbetween springs 11. 12, 13 and 14 and bars 15, 16, 17 and 18respectively. If this trunk is busy. ground potential will he iound onits conductor 75 being supplied thereto over a circuit which may betraced firnn ground through the outer right-hand iii-muture and frontcontact of relay (S3 of the line. with which this trunk line is alreadyoccupied-conductor T2 of said line, inner left hand armature and frontcontact of relay T3, buck contact and left-hand armature of relay 65,conductor 69, bar 16, spring 12 and conductor 76 of the trunk line. Thisground will tie-extended through spring 12 and bu:- iii of the switch ofthe calling line, conductor 69, leit=lu1nd nrmnture and contact spring70, of relay 65 through the winding of relay 7'1'to grounded battery.Relay 71 is energized in this circuit and locked up over the samelocking circuit which was traced for this relay when it was energized onaccount of the busy condition of a calling line with in the branchexchange. In attrecting its outer left-hand armature, relay Tl completesa. circuit from grou'nd, outer 'lefbhnnd armature and front contact ofrelay 't lgspringu 48 and 41, springs 36 and 34 of stepping magnet 23,conductorfil. right-hand nrmziture and front'contact of relay(35,through the winding of relay 65; conductor 66. through the windingof stepping magnet :23 to grounded battery. Magnet 2-3 steps the bnrBone step to the right so as to connect the-springs of the next trunkline with the burs 15. 16. 17nnd 18015 the calling line. In case thisline is also busy, the previously traced circuit for test relay 71 willbe again completed and magnet 93 will he again energized. Thus magnet 23will stop the bar 3 to the right-until thesprings of-an idle trunk-lineengage the line bars or the calling line, at which time, no circuitbeing completed for test relay 71, this relay will retract itsrirmatures to open the circuit for magnet-'23. As relay 65 is includedin this circuit. it will now be deenergizecl and a circuit will becompleted from ground, outer right-hand armature and front contact ofrelay 63, conductor 72, rightf'hnnd armature rind lmck contact of relay71. through the left-hand winding of relay 73 back contact and left-handarmature of reln 65-, conduetor 69, bar 16. spring 12, con uctor 76,through the winding of relay 300 to grounded buttery. Relays 73 and 300are enerflized in this circuit, relay 73 in attracting: its outerleft-hand armature completing a locking circuit for itself hich may betraced from ground outer rightrhnnd arninture and front contact of relay63. conductor 72 outer left-hand armature and front contact of relay 73.through the right-hand winding of said relay to grounded bet ten. and inparallel with this circuit. extending around to the conductor 76 of thetrunk line taken for use from the inner-left han'd armature and frontcontact of rclny 73 end the circuit previously traced. Upon thecnergizniion of relays 300 and T3, :1 circuit is completed for cut-0ftrelay 6-1 of the culling line which may be traced from groundedbuttery,.through the winding of relay U1. springs 42 and 49, outermostrightltnnd armature und front contact of relay i3. and conductor 79,through the front colitut-t and armature of relay 300 to ground. Rein(Si in attracting its armatures cornple'tes a circuit for linerelny 301of'the trunk which may be traced from grounded buttery. through theleft-hand winding of relay 301; back contact and inner right-handarmature of relay 30-3, conductor 7?, spring l3, her 1 springs 40 and46, front contact and outer nrmatureof relay 61, through the up priratnsut substation A, inner armature-and front contact of relay (51, springsM and 39. bar 18, spring lat-conductor TS cuter right-- lizindurinnthrehand' back-contact of relay 302. through the right-hand windingof relay 301 to ground. Reilly 301 ill-attracting its inner armature,completes an obvious'circuit'ior relay 303 whichis ener 'zed andcompletes a circuitirom ground; ron'tv con tnct and armature of -relay303 conductor springll, bar-15, through the winding of :elziy (S3 torounded buttery.- Relay 63 is held energize in this-circuit during theremainder of the connection afterarelay 59 is doc nbrgizcd due to-theoperation of relay 61;. In attracting its 'outer armature, relay 301extends ground through-the outer armature and spring 304- of relay '301and. the buck contact and left-himdurmature-lof relay 302. throughthe-winding cfsup'ei'visory rcluy 306 to bhe-ringcontact-spring of jack1 .07. A circuit also oomplebedr'irom ground. outer armature andspring:- 3650f inlay i301. through the armature'nnd-oontact of sleeverelay 308 and the winding of relay 309 to grounded battery. Relay 309 isenergized in this circuit and. iriattracting its armature. completesa-cii'cuit to light the line himn 310. The operator, observing thislight, inserts plug 311' ofnnidlc cord circuit in answering jack-307;thereby completing a circuitfrom grounded buttery. through the-lowerright-hand windingmf repeating-001F312, through the winding ofsupervisory relay 313. ring contacls-of'plug 311 and jack 307 overthe=circuit traced for supervisory relay 306 to around at theouter'a'rmature of relay 301. Relays 313 and 306 are energized-in thiscircuit. #Suprvisory relay 31-3, in attracting its armature, rovides'ashunt circuit for lamp- 314. extinguishing this lamp which was lightedover a. circuit from'betterry. through-lamp 314, sleeve contacts of plu311 and jack 307, undeleeve relay 308 to ground upon the insertion 'ofthe plug in the jnck. Relay 308. in rittraciingits-nn'nature,interrupted the circuit 01' relay 309 to extinguish lamp 3101"Re'lay306, in attracting its inner armature, completes an obvious circuit forrelay 303'to hold this relay energized upon the deenergization of relay301.

5 In attracting its'outer armaturey-relay 30G completes" anobvionscircuit for relay Relay 302 in attracting its ;right '-hand armatures interrupts'tl'i'e circuit of relay 301' and coiripletes 'a'circu'it' from" the 5 central office cord circuit to the. 'cauiiigsubstation which conductor 7 8,"sp'riiig 14, bar '18," spri'ngs 39 and4:4, "fr'o"tfcont a'ct"and inner armaturc ofrelay" '1"; hibiigli-theapparatus at substation -!i',jouter armature and from; contactof relay 61, springaeand 40.!sar 17, spring and front contact of relay302], through the winding b f s'upervisory 'relay'306jring con.- tactsof. jack ,30Land, plug .311, th rough-the winding 'of supervisory relay313 and the lower right-hand winding of repeating coil 312 to battery.Relays 313 and 306 are held energized in this circuit and the operator,by depressing her listening key 315. will con 'nect her head set, notshown, to the line and may inquire the desired number and com plete theconnection to the called subscriber in any well-known manner. IVhen thesubscriber at station A replaces his receiver on its book at the end ofthe conversation, he

85 interrupts the circuit traced for relays 313 and 306 to deenergizethese relays. Relay 313, in deenergizing, removes the shunt around thelamp 314 to light this lamp and the operator thereupon removes the plug40 311 from jack 307. Relay 306. in retracting:

its armatures, deenergizes relays 302 and 303. Relay 303, in retracting:its armature, interrupts the circuit previously traced for relay 63 ofthe calling line and the consequent deenergization of this relay causesre- 'lease of all the apparatus at the branch exchange in the mannerdescribed for the release of a connection between two substations withinthe branch exchange. Relay 73,

in deenergizing. interrupts the circuit for relay 300 and the system iscoiupletel restored.

The central office operator. desiring connection with a substation inthe branch exchange shown in Fig. 1, after making the usual busy testwith plug 200 and jack 20]. on finding the line idle, inserts the plug200 in the jack 201 and depresses her dialing key 202. In inserting; theplug into the jack, a

circuit was completed from battery, through the winding of relay 203.sleeve contacts of plug 200 and jack 201, through a resistance, toground, to energize relay 203. In depressing her dialing key, theoperator completes a circuit for line relay 59 of the trunk line whichmay be traced from grounded battery. through impedance 62, winding ofrelay 59. hack contact and outer armature of relay 6i, conductor'204.ring contacts n jar-K 201 8112: plug 200 lower alternate contact ofdialing key 202. through the normally closed springs of the operatorscalling device 205, upper alternate contact. oi 'key'202. contact andarmature of relay 203, tip contacts of plug 200 and jack 201'. conductor206, inner armature and back contact of relay 61. through impedance 60springs 53 and 54 and second ary winding of tone source to ground.t'elay 59 is energized in this circuit. thereby "causing theenergization of relay 63 in the samcmanner as was described for the-casefwlien alsubsc-riber at" the hra'ncli 'eschangc 'initiatedfa' call. Theoperator now dials the f'number of the wanted. subscriber. therebyi'nterru'ptingat the springs of the call ng device";205 the'circuittraced for relay 59.

' After' the operator has dialed this number.

she-releasesher key"202 thereby completing a substitute circuit from thenormal contacts of key 202 and the right-hand windings of repeating coil207 instead of through the alternate contacts of key 202 and the callingdevice 205 to maintain relay 59 energized. Since the operation of theswitch at the branch exchange is exactly the same as was described inconnection with a call between branch exchange subscribers, it will notbe further described at this time. In case the called line is busy. theoperator by depressing her listening key 208 will receive a busy toneand, after informing the calling subscriber, may remove the plug 200from iack 201, thereby interrupting the circuit of relay 59 and causingthe release of the apparatus at the branch exchange in a mannerpreviously described. In case the called line is idle. the operator willhe informed of the termination of the conversation by the lighting ofthe supervisory lamp associated with the answering end of the cordcircuit (not shown) and will thereafter disconnect.

What is claimed is:

1. In a telephone system, an incoming line terminating in a set ofmultiple contacts. a number of outgoing lines, a contact operatingmember individual to each of said outgoing lines, a movable bar. meansfor imparting longitudinal motion to said bar. and mechanical means forsuccessively actuating said contact operating members to interconnectsaid incoming line with said outgoing lines upon movement of said bar.

2. In a telephone system. an incoming line terminating in fixed bars, amovable bar parallel to said fixed bars, a number of transverse armsresting on said movable bar, a number of outgoing lines terminating incontacts carried by said arms. and means controlled over said incomingline for advancing said movable bar to selectively operate said arms tointerconnect said incoming line to one of said outgoing lines.

3. In an automatic switch, a number of contact operating members, amovable bur, means for impartin longitudinal motion to said bar, andmechanical means for successively actuating said contact operatingmembers upon movement of said bar.

4. In an automatic switch, a number of line bars, a number of arms,contacts carried on said arms to cooperate with said linc bars; amovable bar to mechanically control the movement of said arms, and meansfor moving said bar to selectively operate said contacts.

5. In an automatic switch, a number of pivoted arms, contacts individualt0 said arms operated by movement thereof, a notched bar upon which saidarmsrest, and means for moving said bar to successively move said armsinto engagement with said notches to operate their associated contacts.

6. In an automatic switch, a longitudinally movable ban, ratchet teethon one am face of one bar, a number of pivoted arms resting on theopposite surface of said ba r, a notch cut in said bar individual toeach pivoted arm, the distance between successive notches being greaterthan the distance 9 between successive arms by an amount equal to thelength of a number of said ratchet teeth, a pawl to cooperate with saidratchet teeth to move said bar to successively engage; said arms withtheir notches, and con tacts operated by the engagement of each arm withits notch.

7. In an automatic switch, a number oi pivoted arms, a bar on which saidarms rest, notches and a cam surface on said in bar to successivelyrotate said arms durin the .-advancement of said bar, contacts 5;divridual to said arms. operated by rotation thereof, and means foradvancing. said bar.

Inwitness whereof I hereunto subscribe 4.3

my. name this 13th day of January A. D.

SAMU L B, WILLIA S, J R.

